EXCITATION METHOD OF COAXIAL HORN FOR WIDE BANDWIDTH AND CIRCULAR POLARIZATION

摘要

A coaxial feed horn including a dielectric substrate having at least one microstrip feed line deposited on a bottom surface of the substrate and a ground plane deposited on a top surface of the substrate. A cylindrical outer conductor is electrically coupled to the ground plane and an embedded conductor is coaxially positioned within the outer conductor, where the embedded conductor is in electrical contact with the microstrip line. A dielectric member is positioned within the outer conductor and includes a tapered portion extending out of the outer conductor at the aperture. In one embodiment, the dielectric member is a plurality of dielectric layers each having a different dielectric constant, where a first dielectric layer allows for propagation of a TE-n sum mode and a last dielectric layer is positioned proximate the antenna aperture and allows for propagation of a TE12 difference mode.